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Tom and Linda stand at point A. Linda begins to walk in a [#permalink]

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22 Jan 2008, 03:09

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Tom and Linda stand at point A. Linda begins to walk in a straight line away from Tom at a constant rate of 2 miles per hour. One hour later, Tom begins to jog in a straight line in the exact opposite direction at a constant rate of 6 miles per hour. If both Tom and Linda travel indefinitely, what is the positive difference, in minutes, between the amount of time it takes Tom to cover half of the distance that Linda has covered and the amount of time it takes Tom to cover twice the distance that Linda has covered?

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22 Jan 2008, 12:23

OA= E

Guys, I remember I saw a solution to speed problems that involved the consept of "shared speed", which deals with those situations by adding speeds (when items are helping each other like in the above case) or subtructing speeds (like a boat against a stream direction).

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20 Feb 2008, 20:46

GGUY wrote:

Tom and Linda stand at point A. Linda begins to walk in a straight line away from Tom at a constant rate of 2 miles per hour. One hour later, Tom begins to jog in a straight line in the exact opposite direction at a constant rate of 6 miles per hour. If both Tom and Linda travel indefinitely, what is the positive difference, in minutes, between the amount of time it takes Tom to cover half of the distance that Linda has covered and the amount of time it takes Tom to cover twice the distance that Linda has covered?